China PriceList for Transformer Wood - High densified electrical Laminated Wood for oil transformer insulation – Trihope manufacturers and suppliers

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PriceList for Transformer Wood - High densified electrical Laminated Wood for oil transformer insulation – Trihope Detail:

Veneer Face Flatness(unit mm)

Normal Thickness	Distance of any point on the upper surface of the veneer that deviates from the light weight straight ruler
Normal Thickness	Veneer length 500	Veneer length 1000
≤15	2.0	4.0
＞15..≤25	1.5	3.0
＞25..≤60	1.0	2.0
>60	1.0	1.5

Appearance Quality

Item	Allowed Range
Swelling	Not Allowed
Cracking
Dead Knot
Foreign-body Adhering
Insect Hole
Rot
Contamination
Bruising	A few allowed, not effect in usage
Impression
Color-odds and splash
Patches per sq.m on surface	≤3

GB Test Item— Before delivery Factory inspection

Test Item		Unit	Standard	Test Method
Vertical Bending Strength	Toward A	Mpa	≥65	GB/T2634—2008 Test Standard
	Toward B		≥65
Vertical Bending modulus of elasticity	Toward A	Gpa	≥8
	Toward B		≥8
Compressibility (under 20MPa)	Toward C	%	≤3
	Crev		≥70
Impact strength (side test)	Toward A	KJ/㎡	≥13
	Toward B		≥13
Interlaminar shear strength		Mpa	≥8
Vertical electric strength (90 ℃ + 2 ℃)		KV/mm	≥11
Vertical electric strength (90 ℃ + 2 ℃)		KV	≥50
Performance density		g/cm³	>1.1~1.2
water content		%	≤6
Shrinkage after drying	Toward A	%	≤0.3
	Toward B		≤0.3
	Toward thickness		≤3
Oil absorption		%	≥8

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